/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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import {ENGINE} from '../engine';
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import {Tensor} from '../tensor';
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import {convertToTensor} from '../tensor_util_env';
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import {TensorLike} from '../types';
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import * as util from '../util';
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import {op} from './operation';
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/**
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* Converts two real numbers to a complex number.
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*
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* Given a tensor `real` representing the real part of a complex number, and a
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* tensor `imag` representing the imaginary part of a complex number, this
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* operation returns complex numbers elementwise of the form [r0, i0, r1, i1],
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* where r represents the real part and i represents the imag part.
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*
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* The input tensors real and imag must have the same shape.
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*
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* ```js
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* const real = tf.tensor1d([2.25, 3.25]);
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* const imag = tf.tensor1d([4.75, 5.75]);
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* const complex = tf.complex(real, imag);
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*
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* complex.print();
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* ```
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*/
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/** @doc {heading: 'Tensors', subheading: 'Creation'} */
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function complex_<T extends Tensor>(real: T|TensorLike, imag: T|TensorLike): T {
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const $real = convertToTensor(real, 'real', 'complex');
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const $imag = convertToTensor(imag, 'imag', 'complex');
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util.assertShapesMatch(
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$real.shape, $imag.shape,
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`real and imag shapes, ${$real.shape} and ${$imag.shape}, ` +
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`must match in call to tf.complex().`);
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return ENGINE.runKernelFunc(
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backend => backend.complex($real, $imag), {$real, $imag});
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}
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/**
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* Returns the real part of a complex (or real) tensor.
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*
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* Given a tensor input, this operation returns a tensor of type float that is
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* the real part of each element in input considered as a complex number.
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*
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* If the input is real, it simply makes a clone.
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*
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* ```js
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* const x = tf.complex([-2.25, 3.25], [4.75, 5.75]);
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* tf.real(x).print();
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* ```
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*/
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/** @doc {heading: 'Tensors', subheading: 'Creation'} */
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function real_<T extends Tensor>(input: T|TensorLike): T {
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const $input = convertToTensor(input, 'input', 'real');
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return ENGINE.runKernelFunc(backend => backend.real($input), {$input});
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}
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/**
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* Returns the imaginary part of a complex (or real) tensor.
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*
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* Given a tensor input, this operation returns a tensor of type float that is
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* the imaginary part of each element in input considered as a complex number.
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* If input is real, a tensor of all zeros is returned.
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*
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* ```js
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* const x = tf.complex([-2.25, 3.25], [4.75, 5.75]);
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* tf.imag(x).print();
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* ```
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*/
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/** @doc {heading: 'Tensors', subheading: 'Creation'} */
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function imag_<T extends Tensor>(input: T|TensorLike): T {
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const $input = convertToTensor(input, 'input', 'imag');
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return ENGINE.runKernelFunc(backend => backend.imag($input), {$input});
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}
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export const complex = op({complex_});
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export const real = op({real_});
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export const imag = op({imag_});
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